Talking-machine.



PATENTED DEC. 3, 190 7.

H. SHEBLB. TALKING MACHINE.

APPLIOATION FILED DEC. 21, 1906.

' INVENTOR ATTORNEY our areas a non.

HGRAGE SHEBLE, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR T O HAWTHORNE & SlElEBLE MANUFACTURING COMPANY, OF PHILADELPHIA, PENNSYLVANIA, A. CORPORATION OF PENNSYLVANIA.

TALKING MACHINE.

Patented. Dec. 3, 1907.

Appli'cation filed December. 21.1906. Serial No. 348.910.

T 0 all who'mt't may concern:

Be it knownthat I, HoRAoE SHEBLE, a citizen of the United States, residing .at Philadelphia, inthe county ofPhiladelphia and State of Pennsylvania, have invented a certain new and useful Improvement in 'llalkingdtfiachines, of which the following'is a specification.

This invention concerns talking machines and relates, more particularly, to the construction of the sound-conveying and amplifying tube or horn.

Thc'object of the invention is to provide an improved construction of such sound-con veying tube, the use of which results in a more faithful reproduction of the sound recorded. I D In the talking machines heretofore constructed, it has been common to provide a sound-conveying tube tapering from end to end, the small end thereof supporting the sound-box. I have found that greater fidelity of sound reproduction can he obtained by so constructing the sound-conveying tube that the interior thereof near the end to which the sound-box is aifixed consists of a plurality of sections of progressively increaslng cross-sectional area. The smallest of these sections communicates With the chamber directly. in rear of the diaphragm of the sound-box and is considerably smaller in cross-section than that chamber. This section is of comparatively short length, as are the succeeding ones except the last which may be of any desired length, and a tapering amplifying horn is connected to the end of this section. 1 If desired, the sectional tube and horn may be coupled together in a man ner permitting relative movement, the sectional tube, in this case, corresponding to the tone-arms now in general use. Preferably the tube and horn are circular in crosssection, the sections of the tube being cylinders of small length except the'last whose length is determined by the length desired for'the complete tone-arm. The sections of the tone-arm are so constructed andasscm bled that the end of each extends a short distance into the end. of the next larger sec tion, so that a series of air chambers or pockets are provided about the ends of the sections. By reason of this construction, the diaphragm" of the sound-box can vibrate more freely as the air pressure thereon is,

under certain circumstances, considerably reduced.

The preferred embodiment of the invention is illustrated drawings, in which Figure 1 is an elevation of a. portion of a talking machine broken away and sectioned in part; Fig. 2 is a longitudinal section of a tone-arm on line 2-2 of Fig. 3; and Fi 3 is a transverse section on line 3-3 of 2.

Referring to the drawings, 1 indicates the motor-box having a motor therem drlving a vertical shaft adaptedto carry the disk sound-record 2. A coupling member 3 is secured to the box 1, having an opening in its upper end. Supported on this member 3 is a tapering amplifying horn 4, the opening in its smaller end communicating with the upper end of the opening through the member 3. Adjacent to the other endof this opening a pin 5 is mounted on the coupling member adapted to support the tone-arm '6. For this purpose the tone-arm has secured thereto a yoke Thaving a cross-head pivoted in the ends -of its arms and carrying a sleeve 8 adapted to fit over the pin 5. Over the in" the accompanying other end of the tonc-armis mounted the sound-box 9 having the stylus bearing in the re'cordgroove. I

The tone-arm consists of a plurality of sections of progressively increasing diameter secured together with the end of each extending a short distance into the end of the next larger section. All of the sections are preferal'uly circular in cross-sect1on, lmt this may be varied if desired. The smallest section 10 is preferably a thin metal tube bent to a ninety degree curve in order to hold the sound-box 1n the proper position, it is comparatively short and its cross-sectional area-is considerably less than that of the chamber back of the diaphragm of the sound-box. The endof this section extends into the next section 11, Whose end is contracted to closely encircle the section 10. The section 11 is of greater-diameter than the section 10, but it is also comparatively short; its end enters the next section 12, which is of greater diameter and Whose end is contracted to closely encircle the section 11. If desired, a sleeve 13 maybe inserted between the ends of the sections 11 and 12 for convenience in assembling the parts, The section 12 is of much greater length the complete tone-arm. the section 12 maybe formed 1n any suitable manner to better coact with the coupling than the sections 10 and 11, its length being such as will givethe desired total length for At its other end,

member 3, as shown. at 14. The interior of the tone-arm, thus constructed, consists of a series of cylindrical sections of progressively increasing diameter and all of these sections except the last are of comparatively short length. By overlapping the sections to form air chambers or pockets within the tone-arm, the air'pressure on the inner side of the diaphragm is reduced and the dia- Ehragm can tl'icrefore vibrate more freely.

y this sectional construction and by maleing the smaller sections of comparatively short length, so that the largest section of the tone-arm is but a short distance from the sound-box, I find that a very superior reproduction is obtained.

tube being; of pro ressively increasing internal cross-sectional areaand the end of each sectionextending within the next larger section and being separated from the Walls thereof by space open to the interior of the tube, and a sound-box secured to the end of the smallest sectio substantially as set forth.

.2. In a talking machine, a tone-arm consisting of a tube of substantial length pivotally mounted at one end and having a plurality of short tubular sections secured to the free end thereof, said sections and said tube being of progressively increasing diameter, the end of each section extending With-- in the end or" the next larger section and being separated from the Walls thereof by space open to the interior of the tube, and the smallest of said sections being curved in the direction of its length, and a sound-box secured to the end of said curved section, substantially as set forth.

This specification si ned and witnessed this 18th day of Decem ber, 1906.

HORACE SHEBLE.

Witnesses;

S. O. EDMONDS, W. S. EnMoNDs. 

